40004440381 has 2 divisors, whose sum is σ = 40004440382. Its totient is φ = 40004440380.

The previous prime is 40004440379. The next prime is 40004440391. The reversal of 40004440381 is 18304440004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39963608281 + 40832100 = 199909^2 + 6390^2 .

It is a cyclic number.

It is not a de Polignac number, because 40004440381 - 2¹ = 40004440379 is a prime.

It is a super-2 number, since 2×40004440381² (a number of 22 digits) contains 22 as substring.

Together with 40004440379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40004440391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20002220190 + 20002220191.

It is an arithmetic number, because the mean of its divisors is an integer number (20002220191).

Almost surely, 2^40004440381 is an apocalyptic number.

It is an amenable number.

40004440381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40004440381 is an equidigital number, since it uses as much as digits as its factorization.

40004440381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 40004440381 its reverse (18304440004), we get a palindrome (58308880385).

The spelling of 40004440381 in words is "forty billion, four million, four hundred forty thousand, three hundred eighty-one".